import java.util.*;
public class p47 {
	public static void main (String args[]) {
	Scanner reader=new Scanner(System.in);
	double sum=0;
	int m=0;
	while (reader.hasNextDouble()) {
		double x=reader.nextDouble();
	m++;
	sum+=x;
	}
	System.out.printf("%d个数的和为%f\n",m,sum);
	System.out.printf("%d个数的平均值是%f\n",m,sum/m);
	}
}

